WHM First Time Install

I just installed cpanel onto a brand new install of RHEL ES 3.4 and all seems to have gone well. Unfortunately, when I try to load up the WHM for the first time (https://XXX.XXX.XXX.XXX:2087/), it prompts for a username and password. Since I can't seem to find any reference to which username and password to use in the documentation, I assume it's the root password. I try those, and then the page never loads. It just sits there, continually waiting for the page to finish loading. It must be trying to do something, because other username attempts immediately are rejected and that's it. When I put in the root username and password, it "goes" but never finishes.

What can I do to get this up and running? This install is part of a evaluation of different control panel systems and this doesn't seem to bode well. If I can't get this to work, we're just going to scrap cpanel and move to the next one on the list.